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EMPLOYEE BENEFIT PLANS - Postretirement (Details) - Postretirement benefit plans - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Postretirement benefit plan disclosure      
Assumed ultimate health care cost trend rate (as a percent) 3.00%    
Accumulated benefit obligation after plan amendment $ 13,235 $ 13,487  
Amounts recognized in accumulated other comprehensive loss (pre-tax)      
Prior service credit (613)    
Net actuarial gain (1,341)    
Net amount recognized in accumulated other comprehensive loss (1,954)    
Changes in the accumulated postretirement benefit obligation      
Benefit obligation, beginning of the period 13,487 13,743  
Service cost 270 288 $ 270
Interest cost 291 403 499
Actuarial (gain)/loss (326) (510)  
Benefits paid (487) (437)  
Benefit obligation, end of the period 13,235 13,487 13,743
Net periodic postretirement benefit cost      
Service cost-benefits attributed to service during the period 270 288 270
Interest cost on the accumulated postretirement benefit obligation 291 403 499
Net amortization (1,405) (1,349) (1,522)
Net periodic postretirement benefit cost (income) $ (844) $ (658) $ (753)